问题 解答题
下面各题写出必要的计算过程,能简便计算的要简便计算.
4
15
×75
7
18
×
9
14
9
14
×21×
2
9
11
14
×
7
10
×
8
33
3
4
×
2
5
+
3
5
×
3
4
4
5
×
5
8
+
5
12
×
4
5
9
20
×(
2
3
-
3
7
5
6
+
5
8
)×
8
25
4
15
×25
8
27
×39
45×
6
35
13×
5
26
5
27
×9×
3
5
4
5
×
5
8
×
5
12
9
14
×21×
2
9
7
9
×
27
49
×
5
7
17×
9
16
3
4
+
5
8
)×32
5
9
×
3
4
+
5
9
×
1
4
5
4
×
1
8
×16
1
5
+
2
9
×
3
10
44-72×
5
12
答案

4
15
×75=20;
7
18
×
9
14
=
1
4

9
14
×21×
2
9
=3;

11
14
×
7
10
×
8
33
=
2
15

3
4
×
2
5
+
3
5
×
3
4

=(

2
5
+
3
5
)×
3
4

=

3
4

4
5
×
5
8
+
5
12
×
4
5

=

1
2
+
1
3

=

5
6

9
20
×(
2
3
-
3
7
),

=

9
20
×
2
3
-
9
20
×
3
7

=

3
10
-
27
140

=

3
28

5
6
+
5
8
)×
8
25

=

5
6
×
8
25
+
5
8
×
8
25

=

4
15
+
1
5

=

7
15

4
15
×25
8
27
×39,

=

4
15
×
683
27
×39,

=

35516
135

45×

6
35
=
54
7

13×
5
26
=
5
2
5
27
×9×
3
5
=1;

4
5
×
5
8
×
5
12
=
5
24

9
14
×21×
2
9
=3;

7
9
×
27
49
×
5
7
=
15
49

17×

9
16
=9
9
16

3
4
+
5
8
)×32,

=

3
4
×32+
5
8
×32,

=24+20,

=44;

5
9
×
3
4
+
5
9
×
1
4

=(

3
4
+
1
4
)×
5
9

=

5
9

5
4
×
1
8
×16=
5
2

1
5
+
2
9
×
3
10

=

1
5
+
1
15

=

4
15

44-72×

5
12

=44-30,

=14.

单项选择题
单项选择题